Arm chair



FIG. 1 is a perspective view of my arm chair;

FIG. 2 is a rear view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a close-up front view of the ornament at the top center of my arm chair.

The broken lines are for environmental purposes only and form no part of the claimed design. 

I claim the ornamental design for an arm chair, as shown and described. 